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J. McKECHNlE AND B. N. WALLIS. MACHINE FOR DRILLING OR'RUNCHING HOLESFOR RIVETS. 1,320,159;

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6 SHEETSSHEET I- yam fit /W, m M M la) run cmhfmnm PLANOURAPHI e61,WASHINGTON, nu c..

I. McKECHNIE AND B. N. WALLIS.

MACHINE FOR DRILLING 0B PUNCHING HOLES FOR RIVETS.

APPLICATION FILED MAR. 27, I919.

1,320, 159. Patented Oct. 28,1919.

6 SHEETS-SHEET 2- THE COLUMBIA PLANocIR APII Co.. WASI-IlNuT0\'. D; C.

J. McKECHNIE AND B. N. WALLIS. MACHINE FOR DRILLING 0R PUNCHING HOLESFOR RIVETS;

APPLICATION FILED MAR- 27,1919.

Patented Oct. 28, 1919.

6 SHEET8SHEET 3- J. McKECHNIE AND B. N. WALLIS.

MACHINE FOR DRILLING 0R PUNCHING HOLES FOR RIVETS.

APPLICAflON FILED MAR. 27,191!!- 1,320,159. Patented Oct. 28,1919.

6. SHEETSSHEET 4- J. McKECHNIE AND B. N. WALLIS. MACHINE FOR DRILLING ORPUNCHING HOLES FOR mvETs.

1 APPLICATION FILED MAR. 27, 19!9- 158,159, Patented Oct. 28,1919.

6 SHEETS-SHEET 5- J. McKECHNIE AND B. N. WALLIS. MACHINE FOR DRILLING 0RPUNCHING HOLES FOR BIVETS.

APPLICATION FILED MAR. 27, 1919.

1,820, 159. Patented Oct. 28,1919.

6 SHEETS$HEET 6.

irn srATns ET @FFTCE.

JAMES MoKECI-INIE, OF BARROW-IN-FUBNESS, AND BARNES NEVILLE WALLIS, 0FKENTS BANK, ENGLAND, ASSIGNORS TO VICKERS LIMITED, OF WESTMINSTER,

LONDON, ENGLAND.

MACHINE FOR DRILLING OR PUNCHING HOLES FOR RIVETS.

Specification of Letters Patent.

Patented Oct. 28, 1919.

Application filed March 27, 1919. eel-m1 No. 285,616.

To all whom it may concern:

Be it known that we, Sir JAMES Mo- Knonnrn, K. B.'E., and BARNES NEVILLEVVALLIS, both subjects of the King of Great Britain, residing,respectively, at Naval Construction Vorks, Barrow-in-Furness, in thecounty of Lancaster, England, and 3 Kentsford Terrace, Kents Bank,Grange.

over-Sands, in the county of Lancaster, England, have invented certainnew and useful Improvements in or Relating to Machines for Drilling orPunching Holes for Rivets or the like, of which the following is aspecification.

" This invention relates to machines for drilling or punching holes forrivets or the like in bars or members of channel, angle orother sectionused in connection with light braced girders or other structural work,the said machines being of the kind in which the bars or members to beoperated upon are fed intermittently through the machine in steps of therequired degree to accord with the pitch of the holes to be drilled orpunched. According to this invention. the bar 0 other member to bedrilled or punched is fed through the machine by appropriate devicescontrolled by a rotatable power driven pitch plate having teethorprojections spaced apart in accordance with the desired pitch of theholesto'be drilled or punched and adapted to cooperate with a stop ortrip device which normally engages with one or other of said projectingelements on the pitch plate to'prevent rotationof said pitch plate andoperation of the work feeding means, there also being provided means fordisengagingsaid trip device thereby enabling the pitch plate to bedriven and the i work feeding means to become operative.

tion means for limiting the extent to which the bar or member to bedrilled can be initially introduced into the machine.

Fig. 6 is a fragmental plan view thereof.

Fig. 7 is a sectional plan view of the pitch controlling mechanism.

Fig. 8 is a sectional elevation of power driven frictional gearing whichoperates in conjunction with the pitch controlling mechanism,.

Fig. 9 is a sectional detail view showing devices for automaticallyrendering the pitch controlling mechanism operative.

Figs; 10, 10*, 10", and 10 are detail views showing devices forautomatically controlling the drill feeding mechanism.

Fig. 11 is a fragmental elevation taken at right angles to Fig. 10, and

Fig. 12 is asectional detail view showing one of the drills and relativeparts.

a denotes the bar which is to be bored, the saidqbar in the exampleshown being of channel formation in cross section and being guidedbetween a feed roller 1) and a pressure roller 0. The pressure roller isyield-ably maintained in engagement with the bar during the feedmovement by a pivoted lever cl (Figs. 1, 4 and 5) having a spring 6associated therewith and connected to arms 7 for supporting the pressureroller, the said lever being actuated against the re sistance of thesaid spring through the medium of a. projection or cam g whichparticipates in the movement of a handle h, whereby the pressure roller0 can be raised by the machine attendant to allow the bar a to beintroduced between it and the feed roller 6 (see Fig. 5).

In order to insur that the bar shall only be lnitially fed forward bythe operator to an extent corresponding to the distance of the front endof the bar from the first hole to be drilled, we provide the stop devicewhlch is shown more particularly by Figs. 5*an'd 6 and which comprises amember 71 having transverse pins 2, with which the front end of the barnormally makes contact. The said member 2' of the stop device is shown,adjustably mounted on a slotted link j extending longitudinally of thema chine and connected at its ends to pivoted parallel arms k and Z, thearm 70 being movable with the aforesaid handl it and cam g and the arm Zbeing provided with a notch or recess m (Fig. 5) normally engaged by acatch constituted by one arm n of a bellcrank lever (Figs. 2 and 8) theother arm 0 of which is ada ited to be actuated at the proper time by apin or projection 39 (Figs. 2, 8 and 7) on the pitch plate hereinafterreferred to, so as to disengage the said arm n from the recess mwhereupon the arms 70, Z are free to move angularly in the direction ofthe arrow (Fig. 5.) When the handle it is now actuated by the machineattendant the stop device will be lowered out of the path of movement ofthe bar and the cam 9 will also be moved simultaneously out of contactwith the lever (Z. The latter then operates under the action of thespring a to bring the pressure roller 0 into engagement with the bar awith the result that the said bar will then be moved forward by the feedroller 6, when the latter is set into motion by the release of the pitchplate as hereinafter described.

The aforesaid pitch plate comprises in the example illustrated arotatable casing (Fig. 7) having annular flanges q, r and s, the flange7* being provided with the aforesaid pin or projection 19 and the flange3 being provided with detachable and adjustable teeth or projections 23which are secured in position by means of bolts u and are adapted to beengaged by a stop device. By setting the said teeth or projections atappropriate distances apart any desired predetermined pitch of the holesto be drilled can be obtained, owing to the fact that the movement ofthe feed roller 6 is continuous while the pitch plate is moving throughthe angular distance between any two of the different teeth orprojections; thus the degree of the feed movement imparted to the bar iscapable of variation to accord with the desired pitch of the holes, byaltering the setting of the said teeth or projections. The said stopdevicecomprises in the example shown a spring bolt o (Fig. 9) normallyprojecting from a supporting box '20 and adapted to engage with theteeth or projections 25 and to be re leased therefrom by automaticmeans. For this purpose a resilient pawl w is mounted on a pivoted levery and arranged to cooperate with a relatively fixed cam z sothat whenthe said lever 11 is actuated in the direction of' the arrow in Fig. 9the pawl 00 first operates to withdraw the spring bolt and then suddenlyrelease it so that it resumes its stopping position under the action ofthe spring a before the neXt tooth or projection on the pitch platearrives adjacent to it. Thesaid cam z is capable of adj ustmentrelatively to the leverg so that the pawl m can 'be'caused to becomedisengaged from the spring bolt 1) at an earlier or a. later period, inthe stroke of the lever 1 according to requirements. The. said pitchplate is rotated through the medium of power driven frictional gearingwhich however only becomes operative when the afore said spring bolt 1)is disengaged from the pitch plate. The said frictional gearingcomprises in the example shown a power driven pulley a (Figs. 2, e and8) provided with a bush a freely mounted on a shaft a the ends of theboss of the pulley being maintained by means of a spring cl infrictional engagement with facings e of leather, fiber or otherappropriate material provided on flanged collars f, g, the collar beingslidably mounted on the shaft 64 and acted upon by the spring d theinitial pressure of which can be varied when required by means of anadjustable collar 72.. By means of the aforesaid friction collar 7 andits spring, the pulley 1) although kept constantly running, will onlyoperate to drive the pitch plate when th spring bolt is disengaged fromthe teeth or projections t thereof. The shaft 64 is provided with acoupling member a for engagement with a corresponding member on ahelical gear wheel 2" keyed to the shaft carrying the feed roller 6, sothat when the spring 'bolt 1) is disengaged as aforesaid, the shaft 6/will drive the feed roller 6, and, through the medium of the helicalgear wheels y" i, the shaft 71;" and toothed'wheelsZ", m and n alsoimpart rotary movement to the pitch plate. The said pitch plate isprovided with an internal gear wheel (Fig. 7) meshing with pinions r ingear with a pinion 0 which is driven from the pinion n. The said pinionsare carried by a disk 8 secured toa. shaft t in axial alinement with theshaft 7), the pitch plate being freely mounted relatively to the saidshafts. The intermediate gearing m may comprise. change wheels for thepurpose of varying the extent of the intermittent movement to suit thepitch required. Striker pegs u, the number and disposition of which canbe varied as required, are provided on the annular flange 9 of the pitchplate, and a worm wheel 71 on the shaft t, gears with a worm w (Fig. 7)which is adapted to be operated in one direction or the other throughthe medium of a clutch 4v and bevel gearing y operated by a star wheel.2 secured to a shaft a and actuated to the desired extent by the saidstriker pegs. lVit-h this arrangement, when the spring bolt 12 isdisengaged from the pitch plate the latter in moving from one pitchtoothor projection to another transmits through the medium of the strikerpegs u and the star wheel 2 a. variable amount of rotation (inaccordance with the number of pegs successively actuating the starwheel) in one direction or the other, to the shaft 73 which in turnimparts (through the medium of the pinions r acting in conjunctionwiththe internal gear wheel 9 and the pinion 0) a corresponding abling ifnecessary the extent of intermittent movement offthe bar a to bemodlfied in fine increments or decrements of adjustment at each pitchmovement. in accordance with the setting of the clutch m. In theposition of the clutch shown in the drawing no modification of theintermittent movement of the bar will occur although the star wheel 2willbe actuated by the striker pegs 11-. Alternatively, the desired fineadjustment of the pitch may bejobtained by transmitting movement fromthe shaft 25" to the shaft 29 through the medium of manually controlleddevices, the pitch plate being rest-rained against movement duringadjustment, by means of the spring bolt 7).

The holes in the bar a may be formed by one or more drilling machinesarranged so that the drilling operation may be carried out at one sideof the bar or at both sides thereof, as required. A shown in Figs. 2 and4, two drilling machines are employed (one arranged to operate oneachside of the bar) ea-ch drilling machinebeing mounted on a bracket 0 soasto be capable of adjust-- ment relatively thereto. The said bracket 0 isalso adapted to be adjustedvertically on guides "(Z provided on astandard or bracket e (Figs. 1, 2 and 4) which in turn A is-adapted tobe adjusted longitudinally on guides provided on a transverselyadjustable bed portion f secured to the base 9 of the machine. In theexample'shown, the drilling machines are interconnected in such a"manner that both of the drills are actuated simultaneously; The drillspindles 1L are each conveniently rotated by means of a power drivenbelt pulley 71 (Figs. 1, .2 and 4). For controlling the feeding and"return movements of the said drill spindles any 45 appropriatearrangementwmay be adopted; in the example illustrated there is a shaftj (Figs 1, 2, 3 and 10 which is mounted in a crankl'disk 70 This crankdisk has an adjustable crank pin (Figs. 10 and 310) which is connectedby means of arod l to an arm m secured to a shaft 71, which at eachrevolution of thecrank disklc is rocked about its axis for hal-farevolution in a forward direction and "half a revolution in a backwarddirection thus causing the drills of the drilling machines to beadvanced and drill the holes in the bar and then to be retracted as willbe readily understood from imparts its rocking movements to a trans-Fig; 2) the said shaft 10 *being provided with helical gear wheels Q2meshing with helical gear wheels 9' on longitudinal shafts s Which bymeans of bevel gearing t operate vertical shafts a These shafts a inturn actuate bevel 'earin 0 and thus img a part movement to shafts 102each of which is provided with a pinion m in gear with a rack 11 (Fig.12) formed on a sleeve 6' surroundingthe corresponding drill spindle 7Land movable axially therewith.

The said sleeve is shown provided with a cylindrical enlargement a forthe reception of the inner end of a hollow member 6 having a pin andslot connection therewith, the outwardly projecting portion 0 of thesaid hollow. member being of conical formation and having securedthereto at its outer extremity a bush (Z through which the drill passesas shown in Fig. 12, the said member 12 being adapted to bearresiliently against the bar a through the medium of a spring 6 andserving in conjunction with a hooklike element 7' tosteady the drillduring the drilling operation and also to facilitate the guiding of thebar a when the latter is be ing fed through the machine. The saidelement f? is pivot-ally connected by means of a bolt or pin 9 to a rodk adjustably secured to a relatively fixed part 2' of the drillingmachine, and has a pin and slot connection with an arm j extendingupward from the part c of the member 6 for the pun pose of enabling thesaid element i to be ;adjusted if required, through th medium of the rodi j The aforesaid shaft n (F igQQ) receives its rocking movement bymeans of clutch mechanism (Figsl, 2, 10 and 10 comprising an axiallymovable member is? havinga featherkey and groove connection with thesaidshaft j and provided with teeth adapted to engage against the powerof a spring 9 with yielda'ble teeth Z (of which one only is shown)pivotally mounted on a member'Z forming part of the belt pulley j". Theclutch member 70 has a face cam m (seeFigs. 10 andlO") and engages witha bell crank lever n for moving the said 1nember [63 toward thedrivingmember Z the arrangement being such that the bell crank lever aonly effects a. slight initial movement of the member 70? toward themember lithe full engagement ofthe two members being effected by the camm coeperating with-a rollero on a fixed bracket 30. The

said cam is of such form that at each revo- I lution of the shaft j theclutch member 7a" k thus rendering the shaft 7' inoperative although thebelt pulley j still continues to be driven.

. j a r l a i I n g v The sald clutch mechanism s automativerse shaftpthrough bevel gearing 0 (see cally controlled from the aforesaid pitchplate, and in the example illustrated this is effected by the projectingnuts w of the bolts u (Figs. 2 and 7) actuating a lever r (Figs. 2, 3and 10) toward the end of the pitch movement. This lever extends at itsupper end through an opening in the base 9 and at its lower end isconnected by means of a. rod 6 to a bell crank lever 25'' engaging aslot in a rod a connected to the bell crank lever n which controls theclutch member 73 of the drill control mechanism. lVhen the parts are inthe normal position shown the bell crank lever t is engaged at theshoulder @2 thereof by a pivoted trip lever '0 The 'movement transmittedby the rod 8 to the bell crank lever t is imparted to the rod 16 andbell crank lever 02 thereby causing initial engagement of the clutchmembers Z to take place, the part '0 of the trip lever having beensimultaneously released from the shoulder 0 and, under. the action ofthe spring o, cooperating with the part 0: of the bell crank lever t soas to cause the clutch members 70 Z to be maintained in engagement withone another, until the cam portion m of the clutch member 70 cooperateswith the roller 0 aforesaid and causes the clutch members 76 Z to befully engaged and the drilling operation to be effected, after which theclutch member 70 is disengaged from the clutch memberl under the actionof the spring 9 and the shaft 3' comes to rest, the trip lever '0 havingpreviously been returned to its normal position by means of the lowerend of the rod u making contact With a pin 11- during the axial movementof the clutch member 713 under the action of the cam m and the bellcrank 713, the bell crank t being simultaneously returned to its normalposition bythe spring g (Fig. 10). The shaft j is provided with the cam2 (Figs. 1, 2, 3 and 9) which is so formed that when the drillingoperation has been effected and the drill withdrawn from the bar a, theaforesaid spring bolt 4; is disengaged automatically from the pitchplate in order to enable the bar a to be fed forward in accordance withthe desired pitch. For this purpose, the aforesaid lever v on which ismounted the pawl for cooperating with the spring bolt 12, isinter-connected by means of a link a (Fig. 9), with a lever Z2 adaptedto be operated by the said cam 2 against the action of a spring 0 Itwill thus be seen that the drilling control mechanism is interconnectedwith the pitch plate through the cam 2 on the shaft j and theintervening parts for actuating the spring bolt 1) and that the pitchplate is interconnected with the drilling control mechanism through thelever r and intervening parts for actuating the bell-crank lever n andthe clutch member 10 so that at each disengagement of the spring boltfrom the pitch plate the lattereffects a feeding forward of the barunder treatment for one step and that as the latter comes to rest thedrilling controlmechanism becomes operative by the movement-of theclutch member 70 and after performing its function comes to rest againjust after the cam 2 has caused the spring bolt to be disengaged fromthe pitch plate for enabling the latter to effect a further feedingmovement of the bar. The pitch plate and the drilling control mechanismthus come into operation alternately and each is dependent upon theother for determining the period at which it will start and stop; therecan thus be no chance of the feeding of the bar and the drilling thereofoccurring out of proper sequence.

A contrivance may also be provided wherebv the clutch devicescontrolling the aforesaid drill feeding mechanism are automaticallyrendered inoperative in the event of the tail or rear end of the barpassing a predetermined point after the required number of holes havebeen drilled. For this purpose, the said contrivance may comprise alever (Z (Figs. 1 and 2). pivotally mounted on a longitudinallyadjustable support 6 carried by a guide bracket f secured to the base 9One endof the lever (Z is provided with a roller or pin f restingnormally upon the bar a, and the other end which is preferably madeadjustable is provided with a-roller g for cooperating with a pivotedstop element h? provided contiguous to the upper end of a lever 2'pivotally mounted on the support 6 and adjustably connected at its lowerend to a rod or link 7' extending longitudinally of the machine andconnected at its forward end to a pivoted arm 70* (Figs. 1, 3, 10, 11)provided with a part Z of arcuate form. lVith this arrangement, when thetail or rear end of actuating the arm 70 and causing the arcuate portionZ to become disposed in the path of movement of an extension w of thetrip lever 42 (see Figs. 3, 10 and 11). The trip lever is thus preventedfrom being movedupward to cooperate with the bell crank lever t asaforesaid, any tendency of this bell crank lever to cause the clutchmember is to become engaged'with the driving clutch member Z beingimmediately counteracted by the spring g acting upon the said member it,the cam m being so constructed as to enable this to be effected. Thebell crank lever 15 is shown provid with a handle 79 (r igs. 1, 3 and10) extending outward through a slot in the side of the base g? wherebythe machine attendant can render the clutch mechanism operative when abar has been placed inthe machine and it is desired to start thedrilling of the holes of the teeth or projections 25 on the pitch plateto prevent rotation thereof. The machine attendant then actuates thehandle p (Figs. 3 and 10) and thereby causes the clutch members W, Z toengage whereby the crank disk 70 (Figs. 1, Qand 3) is rotated a singlerevolution and during one half revolution thereof effects throughthemedium of the arm m and inte1wenin'g gearing the feeding movement of thedrill spindles h which are rotated by means of the belt driven pulleys iand thus drill the holes in the bar. The return movement of the drillspindles after performing the drilling op" eration is obtained by areversal of the direction of rotation ofthe. said gearing which takesplace during the other half revolution of the crank disk. Toward theterminationof the return movement of the drill spindles, the cam 2(Figs. 1, 2, 3 and 9) actuates the lever 6 thereby causing the pawl :0(Figs. 3 and9) to withdraw the spring bolt 2; from engagement with thesaid tooth or projection t on the pitch plate. The

said pitch plate is thus free to be actuated from the power drivenpulley Z) through the frictional gearing and interposed shafts a is andgear wheel associated therewith. Meanwhile the clutch member 76 Z aredis engaged by means of the spring f (Fig. 7

as aforesaid, to render the crank disk Z0 inoperative, and theprojection 12 (Figs. 2, 3 and 7 on the pitch plate comes into contactwith the arm 0 of the bell crank lever 'n, 0 so as to disengage the armn from the recess in the lever Z and enable the stop device to be movedout of the path of movement of'the bar which is then fed forward by thepressure and feed rollers throughthe intervention ofthe aforesaidfrictional gearing. This forward feed of the bar continues until thespring bolt 0 which promptly returns to its normal position after. eachactuation thereof by the pawl 00 as afore-- said, stops further movementof the pitch plate by the next tooth or projection 6 therej on engagingwith the saidspring bolt where upon the feedlng movement of the barceases and the drills are brought into operation to drill the nextholes, the clutch mechanism controllingthe disk k being initiallyrendered operative through the medium ofthe lever r and bell crank leveri interconnected therewith, the lever r being actuated by thenut w ofthe said neXt tooth or projection t prior to the latter being engaged bythe spring bolt. After this drilling operation has beenperformed, thecam 2 again comes into action to withdraw the spring bolt as aforesaidand permit the pitch plate to be set in motion and the bar to be fedforward to the next position in which the holes are to be drilled, thepitch plate in turn controlling the actuating of the drills and so onuntil the required number of holes have been drilled. As the bar ismoved forward by the pressure and feed rollers after the final drillingoperations the tailor rear end thereof will become disengaged from theroller or pin 7 (Figs. 1 and 2) and the lever (l will be moved about itspivot in the direction of the arrow m and the other roller g moved outof contact with the stop element k on the lever 71". The lattertherefore will he moved about its pivot in the direction of the arrow aby means of the spring 0* and rod j whereupon the arm 7% (Figs. 1, 3, 10and 11) is actuated and causes the arcuate portion Z" thereof to comeinto the path of movement of the extensions 0 of the trip lever o andthus prevent the drilling control mechanism from becoming operative.

The mechanism for enabling the extent of intermittent movement of thebar to be modified as aforesaid, is only rendered operative through themedium of the striker pegs u, star wheel z and clutch w, when it isdesired to obtain fine increments or decrements of adjustment at eachpitch movement, the clutch :12 being normally in the neutral positionshown in Figs. 2 and 7 It will be understood that while the embodimenthereinbefore described provides only for the drilling of the holes inthe bar, the machine may be readily adapted to punch the said holes. Themachine may also be varied in many respects, for instance, the aforesaidpressure and feed rolls may be dispensed with, in which event anintermittently operated endless chain or chains or similar devicesprovided with feed dogs and acting in conjunction with the pitch plateand the aforesaid stop or trip device may. be employed for the purposeof supporting the bar and feeding it through the machine in accordancewith the desired pitch of the holes to be drilled or punched. It willalso be understood that instead of the pitch plate being controlledautomatically as above described it may be controlled manually in whichcase the disengagenient of the aforesaid spring bolt from the pitchplate would be effected by a hand lever or pedal suitably connectedtherewith.

What we claim and desire to secure by Letters Patent of the UnitedStates is j In a drilling or punching machine, the

combination with means for feeding the work through the machine, of arotatable power driven pitch plate interconnected with the work feedingmeans and having projecting elements spaced apart in accordance with thedesired pitch of the holes to be drilled or punched, a trip devicenormally engaging with one or other of said projecting elements on thepitch plate to prevent rotation of said pitch plate and operation of thework feeding means, and means for disengaging said trip device andenabling the pitch plate to be driven and the work feeding means tobecome operative.

2. In a drilling or punching machine, the combination with means forfeeding the work through the machine, of a rotatable power driven pitchplate interconnected with the work feeding means and having projectingelements spaced apart in accordance with the desired pitch of the holesto be drilled or punched, a trip device normally engaging with one orother of said projecting elements 011 the pitch plate to preventrotation of said pitch plates and operation. of the work feeding means,means for disengaging said trip device and en abling the pitch plate tobe driven and the work feeding means to become operative, and gearingfor enabling fine increments or decrements of adjustment of the workfeeding means to be obtained at each pitch movement.

3. In a drilling or punching machine, the combination with means forfeeding the work through the machine, of a rotatable power driven pitchplate interconnected with the work feeding means and having projectingelements spaced apart in accordance with the desired pitch of the holesto be drilled or punched, a trip device normally engaging with one orother of said projecting elements on the pitch plate to prevent rotationof said pitch plate and operation of the work feeding means, drill orpunch controlling mechanism and means interconnecting the trip deviceWith said mechanism for disengaging said trip device and enabling thepitch plate to be driven and the work feeding means to become operativewhen the drilling or punching operation has been effected.

4:. In a drilling or punching machine, the combination with means forfeeding the work through the machine, of a rotatable power driven pitchplate interconnected with the work feeding means and having projectingelements spaced apart in accordance with the desired pitch of the holesto be drilled or punched, a trip device normally engaging with one orother of said projecting elements on the pitch plate to prevent rotationof said pitch plate and operation Copies of this patent may be obtainedfor five cents each, by addressing the -efl"ected,drill or meansinterconnecting sald feedmg mechof the work feeding means, means fordisengaging sald tIlpdBVlCB and enabling the pitch plate to be drivenand the work feed-.

ing means to become r'operative, drill ior punch feeding mechanismandmeans interconnecting said mechanism with said pitch plate for enablingsaid mechanism to become operativewhen the work hasbeen fed to thedesired extent.

5. In a drilling or punching machine, the combination with means forfeeding the work through the machine, of a rotatable power driven pitchplate interconnected with the work feeding means and having projectingelements spaced apart in accordance with the desired pitch of the holesto be drilled or punched, a trip device normally engaging with one orother of said projecting elements on the pitch plate to prevent rotationof said pitch plate and operation of the work feedingmeans, drill orpunch controlling mechanism, means interconnecting the trip device withsaid mechanism for disengaging said trip device and enabling the pitchplate to be driven and the work feeding means to become operative whenthe drilling or punching operation has been effected, drill or punchfeeding mechanism, and means intercon necting said feeding mechanismwith said pitch plate for enabling said feeding mechanism tobecomeoperative when the work has been fed to the desiredextent.

6. In a drilling or punching machine, the combination with means forfeedingthe Work through the machine, of a rotatable power driven pitchplate interconected with the work feeding means and having proj ectingelements spaced apart in accordance with the desired pitch of the holesto be drilled or punched, a trip device normally engaging with one orother of said projecting elements-on the pitch plate to prevent rotationof said pitch plate and operation of the work feeding means, drill orpunch controlling mechanism, means interconnect ing the trip device withsaid mechanism for disengaging the trip device and enabling the pitchplate to be driven and the work feeding means to become operative whenthe drilling or punching operation has been punch feeding mechanism,

anism with said pitch plate for enabling said feeding mechanism tobecome operative when the work has been fed to the desired extent andgearing for enabling fine increments or decrements of adjustment of thework feeding means to be obtained at each pitch movement.

JAMES MGKEGHNIE,

Commissioner of CPatents,

Washington, D. G.

